Electric coil.



No. 812,657. PATENTED FEB. 13, 1906.

I. KITSEE.

ELECT G COIL.

APPLIOATIO ED SIBPT.10,1904.

UNITED STATES PATENT OFFICE; w

ISIDOR KYITSEE, OF PHILADELPHIA, PENNSYLVANIA.

ELECTRIC cou.

the city and county of Philadelphia, State of Pennsylvania, haveinvented certain new and useful Im rovements in Electric Coils,

. of which the f lowing is a specification.

My invention relates to an improvement in electric coils.

In the manufacture of electric coils it is. of great importance that thedifferent convolutions of the different-layers should always retaintheir original osition and should not be displaced by handling. It isalso of great importance to have the different convolu tions, as well asthe different la ers, carefully insulated from each other an to bringthe separate convolutions as near together as ossible without reducingthe value of their Insulation. To produce a coil possessing theseproperties in a cheapand efficient manner is the aim of my invention.

It is well known to persons versed in the art that the greatest expensein the manufacture of coils is incurred in the insulation of the wireproper, and for that reason I make use of a perfectly bare oruninsulatedwire wound in a manner so that a slight space remains betweenthe different convolutions. Means for this purpose are well known. I amaware that to-day bare Wires are used in connection with a fibrousthread for the purpose of insulating one convolution from the other; butthese coils are not effective, for the reason that the different"convolutions and layers are easily disturbed and displaced, w ereby thewhole function of the coil is destroyed, and my invention obviates thisdifficulty.

Referring to the drawings, Figure 1 is a longitudinal sectional view ofacoil partially finished. Fig. 2 is a partial Ian and partialcross-section showing a finis ed coil. Fig. 3 is a side elevation of thecompressing-mold inclosing the coil with an electric heating device indiagram.

A is the coil proper, preferably embracing, as illustrated, the core B,the end pieces 0, the non-conducting layersD D D D, and the layers ofwire e e e 0, each layer embracing a series of convolutions e, the wireitself being designated by the-letter E.

F is theouter covering for the coil'proper when finished.

In Fi 3, G represents the compressingmold. his figure also includes theelectric Specification of Letters Patent. Application filed September 101904. Serial No. 224,002.

Patented Feb. 13, 1906.

heating device, embracing the wires 1 and 2, the rheostat 3, and thesource of current 4.

The modus operandi of practicing this. my invention is as follows: Thecore or frame B of the coil is surrounded by a layer of yieldingnon-conducting material, preferably an unvulcanized soft'rubber providedwith the necessary sulfur or compound of same, so that Withthe aid ofheat or heat and pressure the same may later be vulcanized to thereguired degree.

ucting layer is Wound the first layer of bare wire in a manner so thatthe different convolutions should be out of touch with each other. It ispreferred that the windingof the wire on the first non conducting andyielding support should be such that the wire proper is partiallyembedded in this support.

When the first layer of wire is finished, a second layer of yielding andnon-conducting material, preferably, as said above, of unvulcanized softrubber,is placed around this first layer of wire, and these steps arerepeated and continued till the necessary layers of Wires are produced,each layer of wire separated from the next following by a layer of thenon-conducting and yielding material. After the whole coil is finishedthe same is, if the non-conducting material is unvulcanized rubber,inclosed in a compressing device and then subjected to-a hightemperature, Whereby the unvulcanized rubber is, with the aid of thesulfur contained therein, vulcanized in a manner well known to personsversed in the art.

I have shown in Fig. 3 the mode of vulcanization with theaid of anelectric current passing through the Wires of the coil, thereby raisingthe temperature of these wires to the required degree. It is wellunderstood that if two surfaces of soft and unvulcanized rubber aresub'ected to heat and pressure in the presence 0 sulfur they willvulcanize in a manner so as to form one mechanical unit, and if a coilconstructed in the manner as shown and described is subjected to heatand pressure for the purpose of vulcanization it is evident that thedifferent layers of the 'un Around this first non-convulcanized rubberWill form a unit on these ous that the vulcanizing can be. carried on toa degree so as to produce one mechanical mass of What is commonly knownin commerce as hard rubber.

Having now described my invention, what I claim as new, and desire tosecure by Let-' ters Patent, ise l. The method of forming a coil usefulfor electric purposes which consists in forming out of uninsulated orbare wire a series of layers, each consisting of a series ofconvolutions, spacing the convolutions in a manner so as to preventcontact between the same, and insulating the different layers from eachother through the interposition of layers of unvulcanized rubber orcaoutchouc provided with the necessary vulcanizing material and thenuniting the different, layers through the process of vulcanization.

2. In the manufacture of coils useful for electric purposes, the processwhich consists in separating the different layers of wire, as

they are produced, by layers of unvulcanized rubbercontaining itsvulcanizing material, and then subjecting said layers of rubber and wireto the process of vulcanization, thereby uniting the rubber andembedding therein I the wire.

in a support out of alayer of unvulcanized ru her; second, windingthereon uninsulated wire so as to produce a layer, the individual.convolutions of which are separated by a space; third,"covering said laer of wire with a layer of unvulcanized rub er, and multiplying saidsteps so as to produce a coil of required size, and finally subjeetinthe whole to avulcanizing process whereby 518 different layers ofunvulcanized rubber are united and form a substantial covering for thebare wire and whereby the former soft and unvulcanized rubber isconverted into a hard rubber.

4. As a new article of manufacture, a block of vulcanized rubberprovided with a series of spiral-like channels and a series of layers ofmetallic Wires, each consisting of a series of convolutions incased insaid channels.

5. As a new article of manufacture, a block of hard rubber havingincased therein a series of layers of wire, each consisting of a seriesof convolutions, the layers and convolutions insulated from each otherby parts of said hard rubber. p

In testimony whereof I hereby sign my name, in the presence of twosubscribing Witnesses, this 9th day of September,A. D. 1904.

ISIDOR KITSEE. Witnesses:

, EDITH R. STILLEY,

H. C. YETTER.

